The collections held at the Frick Art Reference Library focus on art of the Western tradition from the fourth4th century (A.D.) to the mid-twentieth20th century (A.D.), and chiefly include information about paintings, drawings, sculpture, prints, and illuminated manuscripts. Archival materials augment its research collections.<ref>[http://www.frick.org/research/archives Archival materials]</ref> The library holds more than 228,000 monograph and 3,300 periodical titles. The collection includes several highlights: an auction catalog collection that contains approximately 90,000 items; the [[Frick Art Reference Library Photoarchive]] which holds more than 1.2 million images including photographs and clippings of works of art; and the electronic resources collection which consists of more than 2,000 subscription databases and e-journals, as well as e-books.